Hydromatic brake arrangement



A. Jan. 18, 1944. A, A, ASHTON HYDROMATIC BRAKE ARRANGEMENT 2 Sheets-Sheet 1 Filed Jan. 5, 1942' Snventer HYDROMATIC BRAKE ARRANGEMENT Filed Jan. 5, 1942 2 Sheets-Sheet 2 b Q m 0 O (Ittorneg Patented Jan. 18, 1944 v 2,339,450 nrnnoMA'rrc BRAKE ARRANGEMENT Albert A. Ashton, `Los Angeles, Calif., assignor to Emsco Derrick & Equipment Company, Los Angeles, Calif., a corporation of California Application January 5, 1942, serial No. 425,647

1 Claim.

the drum, it is desirable to use in this equipment an auxiliary or supplementary fluid actuated power absorbing device referred to in the art as a hydromatic brake, which is connected to the drum shaft during the operation of running a string of pipe into the hole.

An object of the invention is to provide cooperating parts whereby the hydromatic brakes may be short coupled to the drum shaft, to minimize the overhang of the vdrum shaft beyond its supporting bearing and to make possible the addition of a hydromatic brake to a drawworks without material increase in the overall length of the drawworks and without the necessity of eliminating from the drum shaft assembly of the drawworks any part necessary for complete service. This last desirable result I accomplish in part by mounting the clutch of the hydromatic brake within a customary or desired part of the drum shaft assembly. One example of this expedient will be perceived from thefollowing. For transmission of power from the drawworks to the rotary machine, it is a custom to mount an idler sprocket assembly on the far end of the drum v shaft, this idler sprocket assembly comprising a pair of rigidly connected sprockets, one of which is driven by a chain from the line shaft of the drawworks and the other of which engages the chain which extends to. the sprocket on the rotary machine. To avoid extending the drum shaft beyond this idler sprocket so as toprovide a shaft portion to which the clutch for the hydromatic brake may be connected, I mount a part of this clutch on the portion of the shaft lying within the idler sprocket and support the idler sprocket on this clutch part by means of bearings.

Among the advantages derived from the invention is to enable the making of a large size drawworks coming reasonably within the special limits of the floor of the derrick, to avoid great increase in the weight and reenforcement of the base or frame'jof the drawworks, and to support the hydromatic brake in such relation to the drum shaft that when desired the hydromatic brake may be removed from its operative position in a direction transverse to the axis of the drum shaft.

Further objects and advantages of the invention will appear in the following part of the specif'lcation. I

Referring to the drawings, which are for illustrative purposes only,

Fig. l is an elevational view of a drum shaft assembly of a type adapted for heavy duty service.

Fig. 2 is a sectional view taken on a vertical plane of the rightward portion of the drum shaft assembly, and showing also the hydromatic brake shaft.

Fig. 3 is a cross section taken as indicated by the line 3--3 of Fig. 2.

The drum shaft assembly shown in Fig. 1 includes a drum shaft I0 supported by spaced bearings II and I2. A cable drum I3 is fixed on the shaft between the bearings II and I2, and brake drums I4 and I5 are supported by the flanges of the cable drum I3. Means are provided for driving the drum' I3 at two different speeds, one of these means comprising a relatively small sprocket I6 fixed on the shaft between the drum I3 and the bearing I2. The other drive means for the drum I3 comprises a sprocket I1 rotatable upon that portion of the shaft I0 which projects leftward from the bearing II and arranged for driving connection with the shaft through a jaw clutch I8 or a friction clutch I9, which is actuated by uid under pressure delivered through a delivery pipe 20 and a swivel connection 2l.

As shown in Fig. 2, the rightward end of the shaft III comprises a shaft portion 22 which projects beyond the bearing I2. A clutch member 23 is mounted on this projecting shaft portion 22. The clutch member` 23 is shown with an annular head or body 24 and a leftwardly extending cylindrical portion 25, there being a bore 26 axially through the clutch member 23 to fit the extending shaft portion 22. Driving engagement between the clutch member 23 and the shaft portion 22 comprises interengaging splines 21 on the shaft and in the bore of the clutch member 23.

An idler sprocket assembly 28 is mounted on the clutch member 23 by means of a dual bearing assembly 29 comprising roller bearings having their inner races in engagement with the' cylindric extension 24 of the clutch member 23.

The bearing assembly 29 is held in position on v the clutch member 23 by a collar 30 which actsl also'as a spacer between the leftward end of the clutch member 23 and the inner race 3| of the shaft bearing l2, the clutch member 23 having a shoulder 32' atthe rightward end of the bearing assembly 29 for limiting rightward movement of the idler sprocket assembly 28 relative to the clutch member 23 which is xed on the end portion 22 of the drum shaft. The idler sprocket assembly 28 includes a cylindrlc wall 33 with sprockets 34 and 35 thereon. An annular keeper ring 38, secured to the rightward end of the drum shaft I by screws 31, holds the sprocket I6, spacer ring 38, inner bearing race 3|, collar 30, and'clutch member 23 on the shaft.

The clutch member 23 has engaging means 39 shown as axially directed v:laws or teeth for engaging cooperating jaws or teeth 40 of a sliding clutch member 4| mounted on the shaft 42 of a hydromatic brake 43. The 'clutch member 4| and the shaft 42 have interengaging splines 44, and this clutch member 4| is movable from the position in which it is shown into engagement with the clutch member 23 in the customary manner employing a conventional clutch shifting ring 45 and a shifting yoke 48.

To illustrate the manner in which the brake drums are cooled, I have shown an annular water chamber 41 formed by an annular wall 48 within the brake drum I5. Cooling water is fed into and taken from this annular passage 41 through inlet and outlet water ducts 49 and 50 which respectively communicate with axially spaced vradial passages 5| and 52 in the drum shaft I0. The inner ends of the radial passages 5| and 52 communicate with spaced points in an axial opening 53 which extends in from the rightwa-rd end of the shaft i0 and has therein inlet and outlet passages 54 and 55 formed by an inserted tube 56 having a head 51 on its inner end positioned between the inner ends of the radial passages 5| and 52. 'I'he tube 56 ex- .tends also within a sleeve 53 which projects through a bore 53 formed axially through the shaft 42 of the hydromatic brake 43. The rightward or outer end of the sleeve 58 is supported by a swivel connection 60 which is in turn sup- .ported by bracket 5| carried by the hydromatic brake 43. The sleeve 58 has an inner reduced end 52 which projects into a counterbore formed in the rightward end of the axial opening 53 of the drum shaft and is engaged by sealing means 63 carried in this counterbore, so that the space within the sleeve 58 around the tube 56 will constitute a continuation or part of the outlet passage communicating with the swivel connection 60 to which inlet and outlet water pipes 64 and are connected.

I claim as my invention:

In a hoisting device or drawworks, the combination of: a drum mounted on 'a drum shaft for rotation therewith bearing means rotatably supporting the drum shaft and positioned so that said drum shaft has a projecting end; drive means on the shaft operative to rotate the shaft and drum; a fluid brake having a brake shaft in axial alignment with said projecting end of said drum shaft; a. clutch part rotatable with said drum shaft comprising a tubular sleeve having an axial bore receiving said projecting end of said drum shaft and a clutch face on the outer end of said tubular sleeve, the exterior surface of said tubular sleeve forming a bearing surface; an idler sprocket assembly rotatably mounted on said bearing surface in axially spaced relationship to said clutch face; a second clutch part connected to and axially movable on said brake shaft, said second clutch part having a clutch face on the outer end thereof for direct end-to-end clutching engagement with said clutch face on said first clutch part.

ALBERT A. ASHTON. 

